Bathroom Fan Vent Flapper

If you hear noise from the bathroom fan when it's windy, there's an easy explanation. It's because the wind is picking up the vent flapper and dropping it down repeatedly. You can resolve the issue by adding sound absorption, weight the damper, or replace it with a spring.

I have a two-year-old home which has vent fans in the two bathroom ceilings. We live in a windy area, and the flabber doors on the fans are often banging open and shut. The noise is annoying, but I'm also concerned about the heat loss in the winter.

The fans are vented out the roof through a. It would be easy to test with the bath fan turned off. Take an incense stick or cigarette and let it smoke near your bath vent.

If the smoke blows toward you, the system is leaking outside air into your house. The vent exits to the roof which has the standard Home Depot purchased style damper with built in flapper style damper. What is happening is that slight air pressure changes in the roof are causing the fan's built in plastic damper to ever so slightly lift and then drop.

The exhaust port flapper is a circular piece of plastic that opens when the bath fan is turned on. And when the fan turns off, this damper closes by gravity (or a small metal spring) in order to prevent air infiltration. Why Vent Flappers Make Noise? A vent has one main purpose and that is ventilation.

Some houses have ductwork installed in the home. But adding a vent in the existing ductwork would boost the ventilation better. House vents are usually installed in the kitchen, toilets, and storage.

They come with or without an exhaust fan. But most vents have metal flappers attached to the outside area of the. How do I Stop my bathroom vent from making noise? The ideal solution to eliminate your noise problem is to replace the damper with a spring.

This video describes a design flaw in nearly all bathroom exhaust fans. The built in flapper valve is not heavy enough to stay closed when winds are even mi. Ok, I removed the bathroom vent fan from the ceiling, but I left the plastic damper duct connector with the flapper door assembly to remain in place on the vent tubing that runs up through the attic.

3. Clean the vent regularly: Keeping your bathroom vent clean will help reduce dust and dirt buildup, reducing noise from the air vents. 4.

Eliminate noise sources: If you can hear your bathroom fan vents running, it's time to clean them out!